I looked high and low for reproduction ukulele pegs, but they don't seem to be out there. However, violin pegs, especially the plain ones are similar. I had rosewood pegs fit to two of my vintage ukuleles (by my luthier who is primarily a violin/cello luthier).
They look and work great. If anything, they look classier than the original wood pegs I have on my Royal Hawaiian ukulele.